/*
 * Copyright (c) 2021, Peter Abeles. All Rights Reserved.
 *
 * This file is part of BoofCV (http://boofcv.org).
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package boofcv.abst.tracker;

import org.jetbrains.annotations.Nullable;

import java.util.ArrayList;
import java.util.List;

/**
 * Utility functions for working with and used by implementations of PointTrackerUtils
 *
 * @author Peter Abeles
 */
public class PointTrackerUtils {
	public static List<PointTrack> declareTrackStorage( @Nullable List<PointTrack> list ) {
		if (list == null)
			list = new ArrayList<>();
		list.clear();
		return list;
	}

	public static List<PointTrack> addAllTracksInList( List<PointTrack> tracks,
													   @Nullable List<PointTrack> output ) {
		output = declareTrackStorage(output);
		output.addAll(tracks);
		return output;
	}
}
